2022 Stereophile Recommended Component

Unique to its class, Pre Box S2 Digital dual-mono configuration with the highest class D/A converters by Sabre. Their ESS9038 DAC chips ensure audiophile-grade sound from a compact, affordable design capable of high-resolution audio up to 32bit/768kHz PCM and DSD512. Among the first of our devices to support hardware MQA unfolding via USB, it also features our proprietary ‘optimal transients’ digital filter and our proprietary clock circuitry design.

With the proprietary clock design we have managed unrivaled jitter rates of 100 Femtoseconds, easily outperforming many renowned and respected audiophile clock generators. With organic polymer capacitors and thin-film mini-MELF resistors, we were able to create a tiny device that screams value in terms of sonic performance. With a total of seven digital filters, sonics can be adjusted based on your preferences.

Additional information
Weight 0.366 kg
Dimensions 12.2 × 10.3 × 3.7 cm



  • Dual mono construction
  • High end ESS Sabre ESS9038 dual DACs
  • Proprietary clock circuity design
  • Organic polymer capacitors and thin film miniMELF resistors
  • MQA hardware decoding
  • DSD64, DSD128, DSD256 & DSD512 (DoP, DSD512 native)
  • Up to 24bit/192kHz for optical & coax inputs
  • 8 selectable digital filter characteristics
  • 1 proprietary optimum transient digital filter
  • Headphone output on the front (6.3mm)
  • Synchronization of all internal oscillators
  • Jitter as low as 100 Femtoseconds
  • Gold plated four layer PCB
  • Full alu/metal sandwich casing in silver or black
  • Handmade in Europe


  • Digital inputs: 1x USB (B)
  • 1x Co-axial (RCA)
  • 1x Optical (TOSLink)
  • D/A-converter: 2x ESS9038Q2M 32-bit
  • Playback formats USB: up to DSD512 (DSD1024), PCM up to 32b/768kHz
  • Optical: PCM up to 24b/192kHz
  • Coaxial: PCM up to 24b/192kHz
  • Filter settings: 7 different selectable on front
  • Frequency response: 20Hz – 20kHz
  • Analogue outputs: 6.3mm Headphone (front), 1x Variable Out (RCA)
  • Output voltage: 2,05 V
  • Minimal recommended headphone impedance: 8ohms
  • Headphone output power: 6,6mW/600ohms, 68mW/32ohms
  • THD: 0,0003% at 0dB, 2V RMS, 1kHz
  • Dynamic range: 124dBA
  • Outboard power supply: 5V/1A DC (included)


*This version of the driver for the Pre Box S2 Digital (‘Downloads’ section above) is specifically for computers that are running versions of Windows released BEFORE Windows 10. Attempting to install this driver on a computer running Windows 10 will potentially overwrite the existing correct driver and cause the Pre Box S2 Digital to behave in unexpected ways. Windows 10 already contains the correct driver for the Pre Box S2 Digital.